T, I like the idea here. I especially like the shape of the ends and the heft of the handle. One of the things boxes do best is to help organize our stuff. It does not have the elegance of your sleek lines in your design, but I think I would have rounded off the inside edges of the top and maybe worked on a way to make the tack hammer fit through holes so the handle of the hammer could act as a handle for the box. Maybe embedding a rare earth magnet on the box side and hammer side to replace the bent nail would help your design.

This is the idea only it is an ax used as a box handle. Notice the end of the box is used as a stop to keep the ax from sliding out.